condition mean min max ZT0-3 2.5877575 2.43332 2.7421949999999997 ZT4-7 1.687665 1.687665 1.687665 ZT8-11 3.130595 3.130595 3.130595 ZT12-15 0 0 0 ZT16-19 3.66291 3.66291 3.66291 ZT20-23 3.731645 3.731645 3.731645